Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Joel A. Rivera-García; Jessica Mosqueira-Yauri; T. K. Gundu Rao; Edwar A. Canaza-Mamani; Giovanni G Fiorini; J. F. Benavente; Carlos D Gonzales-Lorenzo; José F D Chubaci; Shigueo Watanabe; Jorge S. Ayala-Arenas; Nilo F. Cano

doi:10.1016/j.jlumin.2023.119906

Synthesis and thermoluminescence of Ce-doped CaF₂ phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Joel A. Rivera-García, Jessica Mosqueira-Yauri, T. K. Gundu Rao, Edwar A. Canaza-Mamani, Giovanni G Fiorini, J. F. Benavente, Carlos D Gonzales-Lorenzo, José F D Chubaci, Shigueo Watanabe, Jorge S. Ayala-Arenas, Nilo F. Cano

Departamento Académico de Física

Research output: Contribution to journal › Article › peer-review

Abstract

We present here the thermoluminescence (TL) properties of Ce-doped CaF₂ (CaF₂:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH₄F to (Ca(NO₃)₂)⋅4H₂O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF₂:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF₂:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF₂:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O⁻ ion. The O⁻ ion correlates with the TL peak at 120 °C. Center II with a g-value of 2.0057 is ascribed to a radiation-induced Fe³⁺ ion and is observed to relate to the high-temperature TL peak at 280 °C. The UV–Vis optical absorption of pure CaF₂ and Ce-doped phosphors was investigated.

Original language	English
Article number	119906
Journal	Journal of Luminescence
Volume	261
DOIs	https://doi.org/10.1016/j.jlumin.2023.119906
State	Published - Sep 2023

Bibliographical note

Funding Information:
This work was supported by “Universidad Nacional de San Agustín de Arequipa” (Process number IBAIB-02-2018-UNSA). We are grateful to Dr. B.C. Bhatt, ex Bhabha Atomic Research Center, Mumbai, India for his suggestions. The authors would like to express our thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the gamma irradiation of the samples for the EPR measurements.

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

Calcium fluoride
Defect centers
EPR
TL

Access to Document

10.1016/j.jlumin.2023.119906

Cite this

Rivera-García, J. A., Mosqueira-Yauri, J., Gundu Rao, T. K., Canaza-Mamani, E. A., G Fiorini, G., Benavente, J. F., D Gonzales-Lorenzo, C., F D Chubaci, J., Watanabe, S., Ayala-Arenas, J. S., & Cano, N. F. (2023). Synthesis and thermoluminescence of Ce-doped CaF₂ phosphor: Study of defect centers responsible for the TL emission by EPR analysis. Journal of Luminescence, 261, [119906]. https://doi.org/10.1016/j.jlumin.2023.119906

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title = "Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis",

abstract = "We present here the thermoluminescence (TL) properties of Ce-doped CaF2 (CaF2:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH4F to (Ca(NO3)2)⋅4H2O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF2:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF2:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF2:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O− ion. The O− ion correlates with the TL peak at 120 °C. Center II with a g-value of 2.0057 is ascribed to a radiation-induced Fe3+ ion and is observed to relate to the high-temperature TL peak at 280 °C. The UV–Vis optical absorption of pure CaF2 and Ce-doped phosphors was investigated.",

keywords = "Calcium fluoride, Defect centers, EPR, TL",

author = "Rivera-Garc{\'i}a, {Joel A.} and Jessica Mosqueira-Yauri and {Gundu Rao}, {T. K.} and Canaza-Mamani, {Edwar A.} and {G Fiorini}, Giovanni and Benavente, {J. F.} and {D Gonzales-Lorenzo}, Carlos and {F D Chubaci}, Jos{\'e} and Shigueo Watanabe and Ayala-Arenas, {Jorge S.} and Cano, {Nilo F.}",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

month = sep,

doi = "10.1016/j.jlumin.2023.119906",

language = "Ingl{\'e}s",

volume = "261",

journal = "Journal of Luminescence",

issn = "0022-2313",

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Rivera-García, JA, Mosqueira-Yauri, J, Gundu Rao, TK, Canaza-Mamani, EA, G Fiorini, G, Benavente, JF, D Gonzales-Lorenzo, C, F D Chubaci, J, Watanabe, S, Ayala-Arenas, JS & Cano, NF 2023, 'Synthesis and thermoluminescence of Ce-doped CaF₂ phosphor: Study of defect centers responsible for the TL emission by EPR analysis', Journal of Luminescence, vol. 261, 119906. https://doi.org/10.1016/j.jlumin.2023.119906

TY - JOUR

T1 - Synthesis and thermoluminescence of Ce-doped CaF2 phosphor

T2 - Study of defect centers responsible for the TL emission by EPR analysis

AU - Rivera-García, Joel A.

AU - Mosqueira-Yauri, Jessica

AU - Gundu Rao, T. K.

AU - Canaza-Mamani, Edwar A.

AU - G Fiorini, Giovanni

AU - Benavente, J. F.

AU - D Gonzales-Lorenzo, Carlos

AU - F D Chubaci, José

AU - Watanabe, Shigueo

AU - Ayala-Arenas, Jorge S.

AU - Cano, Nilo F.

PY - 2023/9

Y1 - 2023/9

N2 - We present here the thermoluminescence (TL) properties of Ce-doped CaF2 (CaF2:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH4F to (Ca(NO3)2)⋅4H2O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF2:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF2:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF2:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O− ion. The O− ion correlates with the TL peak at 120 °C. Center II with a g-value of 2.0057 is ascribed to a radiation-induced Fe3+ ion and is observed to relate to the high-temperature TL peak at 280 °C. The UV–Vis optical absorption of pure CaF2 and Ce-doped phosphors was investigated.

AB - We present here the thermoluminescence (TL) properties of Ce-doped CaF2 (CaF2:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH4F to (Ca(NO3)2)⋅4H2O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF2:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF2:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF2:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O− ion. The O− ion correlates with the TL peak at 120 °C. Center II with a g-value of 2.0057 is ascribed to a radiation-induced Fe3+ ion and is observed to relate to the high-temperature TL peak at 280 °C. The UV–Vis optical absorption of pure CaF2 and Ce-doped phosphors was investigated.

KW - Calcium fluoride

KW - Defect centers

KW - EPR

KW - TL

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U2 - 10.1016/j.jlumin.2023.119906

DO - 10.1016/j.jlumin.2023.119906

M3 - Artículo

AN - SCOPUS:85159086861

SN - 0022-2313

VL - 261

JO - Journal of Luminescence

JF - Journal of Luminescence

M1 - 119906

ER -